Then from §2.7(ii) it is seen that equation (28.20.2)
has independent and unique solutions that are asymptotic to
ζ1/2⁢e±2⁢i⁢h⁢ζ as ζ→∞ in the
respective sectors |ph⁡(∓i⁢ζ)|≤32⁢π-δ,
δ being an arbitrary small positive constant. It follows that
(28.20.1) has independent and unique solutions
Mν(3)⁡(z,h), Mν(4)⁡(z,h) such that